Nanoscale morphology and performance of molecular-weight-dependent poly(3-hexylthiophene)/TiO 2 nanorod hybrid solar cells

Ming Chung Wu, Chia Hao Chang, His Hsing Lo, Yi Shen Lin, Yun Yue Lin, Wei Che Yen, Wei Fang Su, Yang Fang Chen, Chun Wei Chen

Research output: Contribution to journalArticle

32 Citations (Scopus)

Abstract

We have investigated the effect of polymer molecular weight on the morphology and performance of poly(3-hexylthiophene)/TiO 2 nanorod hybrid photovoltaic devices by using scanning near field optical microscopy (SNOM), atomic force microscopy (AFM) and confocal Raman microscopy. From the topography and absorption mapping images, it is found that the rod-like structure of the low molecular weight polymer hybrid film consists of a large amount of grain boundaries and has a less continuous absorption mapping image. In contrast, the larger domain structure of the high molecular weight polymer hybrid film exhibits a continuous absorption mapping image, as a result of enhanced polymer stacking and electronic delocalization. The nanoscale morphology of the hybrid samples with different molecular weights also reveals the nature of photovoltaic performance and carrier transport behavior investigated by the time-of-flight technique.

Original languageEnglish
Pages (from-to)4097-4102
Number of pages6
JournalJournal of Materials Chemistry
Volume18
Issue number34
DOIs
Publication statusPublished - Sep 1 2008
Externally publishedYes

    Fingerprint

ASJC Scopus subject areas

  • Chemistry(all)
  • Materials Chemistry

Cite this

Wu, M. C., Chang, C. H., Lo, H. H., Lin, Y. S., Lin, Y. Y., Yen, W. C., Su, W. F., Chen, Y. F., & Chen, C. W. (2008). Nanoscale morphology and performance of molecular-weight-dependent poly(3-hexylthiophene)/TiO 2 nanorod hybrid solar cells. Journal of Materials Chemistry, 18(34), 4097-4102. https://doi.org/10.1039/b803484b